Disk-Harrow Sharpener. Page: 1 of 5
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Disk-Harrow Sharpener., patent, November 25, 1913; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth858390/m1/1/: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.